this deal requires a coles receipt shop-a-docket. This deal is only available in Brisbane, Ipswich & Logan
shopadocket have $2 docket for a cheese burger and small fries.
not available on their website but can be sourced from Coles supermarket receipts.
or see if they will accept the above screen shot. or image to download here
If you want to be a cheap arse then go for an 80 cent meatless chip-burger and get bun and fries.
If you request this (can't use the touchscreens) from the counter ask for "no patty" -which they remove and removes $1.20 from the price. so you end up with a bun, cheese, pickles, sauce and small fries for 80cents.
80 cent snack.
add a frozen drink for $1 and 30cent cone (who pays for $2 for that?!) and you have the lunch of champions for $2.10
Please note: I've been vegetarian for 20+ years so I always request "no patty" (and no cheese - contains animal rennet). Thus "saving" $1.20 for something I wouldn't eat. Or not paying for something that I don't want. but then again if one of my kids wanted a small fries then I'd rather not pay $2.10 or what ever they cost these days (bring back $1 small fries!!) so this hack works nicely.
Love your idea of the fries burger for 80c. Although cones are 60c now I believe. ☺️